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Coal Measures and Coal Mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining by Russell T. Hartman, 1898

Coal Measures and Coal Mining in Iowa by Russell T. Hartman, 1898, Page 123

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[page]122.[/page] along each valve anterior to the middle; anterior margin nearly vertical rounding into basal margin which is curved gradually around to the posterior margin, posterior margin and hinge line uniting to form an angle of about 120 degrees. Hinge equal or nearly equal to greatest length of shell; beaks prominent projecting upward above hinge and forward beyond any other part of the shell. Surface marked by imbricating lamellae of growth. Geol. Pos. Upper Coal Measures. Locality.-- Winterset, Iowa. Ref. Geology of Missouri, Vol. V. [underlined][underlined]Pinnidae.[/underlined][/underlined] [underlined]Pinna[/underlined] ---. Plate IX. figure. 5. Shell equivalve, wedge shaped; beaks at anterior extremity of shell, posterior
 
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